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Specific heat C ontents: Heating up a substance - specific heat Whiteboards

Specific heat C ontents: Heating up a substance - specific heat Whiteboards. Joule’s Discovery. Falling mass heated water by stirring Heat equivalent of work 1 Calorie = 4.186 J. TOC. Heating up a substance - Specific heat. Q = mc  T Q - Heat (in J) m - Mass (in kg)

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Specific heat C ontents: Heating up a substance - specific heat Whiteboards

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  1. Specific heat • Contents: • Heating up a substance - specific heat • Whiteboards

  2. Joule’s Discovery Falling mass heated water by stirring Heat equivalent of work 1 Calorie = 4.186 J TOC

  3. Heating up a substance - Specific heat • Q = mcT • Q - Heat (in J) • m - Mass (in kg) • c - Specific Heat (in JoC-1kg-1) • T - Change in temp. (oC) • Q -> Kinetic Energy of molecules • (Temperature rises) Some specific heats (in JoC-1kg-1) H2O liquid 4186 H2O ice 2100 H2O steam 2010 Aluminum 900 Iron 450 More in table 14-1 (p 421) TOC

  4. Heating up a substance - Specific heat Some specific heats (in JoC-1kg-1) (in JoC-1mol-1) Aluminum 900 24.4 Carbon 507 6.11 Copper 386 24.5 Lead 128 26.5 Silver 236 25.5 Tungsten 134 24.8 TOC

  5. Specific Heat 1 | 2 | 3 | 4 TOC

  6. A. Nicholas Cheep wants to calculate what heat is needed to raise 1.5 liters (1 liter = 1 kg) of water by 5.0 oC. Can you help him? (c = 4186 J oC-1kg-1) Q = mcT Q = ??, m = 1.5 kg, c = 4186 J oC-1kg-1, T = 5.0 oC W 31,000 J

  7. Adella Kutessen notices what change in temperature if 512 g of iron absorbs 817 J of heat (c = 450. J oC-1kg-1) Q = mcT Q = 817 J, m = 0.512 kg, c = 450. J oC-1kg-1, T = ?? W 3.55 oC

  8. Anita Break notices that a chunk of Aluminium absorbs 12,000 J of heat while raising its temperature a mere 3.45 oC Of what mass is this chunk? (c = 900. J oC-1kg-1) Q = mcT Q = 12,000 J, m = ??, c = 900. J oC-1kg-1, T = 3.45 oC W 3.9 kg

  9. Anne Sodafone does an experiment where 5.412 kg of a mystery substance absorbs 12,510 J of heat while raising its temperature 2.19 oC What is the specific heat? Q = mcT Q = 12,510 J, m = 5.412 kg, c = ??, T = 2.19 oC W 1060 J oC-1kg-1

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